Slight new growth leaf discoloration

Humic acid will help and so will lactic acid bacteria.

Nitrogen toxicity and heavy. Some will say tobacco mosaic . Not sure what causes it, but excess Nitrogen in mix with maybe potash will get you that bright green stripes inside of dark green. If soil , just phed water when needed. Wet/ dry cycle is very important. That diet for at least 2 weeks. If coco - flush, load way less with your

No deficiency, but first signs of burning from excessive feeding of nitrogen/fertilizers in general. Feed less/less often.

Hi buddy looks like a build up of some kind of nutrient. I would give her a flush and see whats shes like in a few days then reitroduce feed at a lower rate :) then increase back upto the feed table :) Best of luck buddy nice looking plant anyway :)